Thanks for the report! Still waiting for some localization strings before I'll upload the next version. In the meantime, you could fix that yourself by changing
script.on_event(defines.events[event], function (event)
to
script.on_event(defines.events[event], function (event)
if not game.players[event.player_index].character then
return
end
This should be line 580. Please not that the mod won't track what you have in your inventory when you're in Editor or God mode. So, if you should decide to change to a character later on, you'll start with an empty inventory. I may add God-mode compatibility in the future (not sure if that really would be a good idea), but for now the current fix should still be better than a crash. :-)